Dictionary > Hunter and driffield curve

Hunter and driffield curve

Definition
noun
A graph in which the density of the photographic film (vertical axis) is plotted against the logarithm of the relative exposure (horizontal axis), to illustrate the photographic characteristics of an emulsion (e.g. on an x-ray film).
Supplement
A characteristic curve depicts and measures the relationship between exposure and photographic density. It is used to describe the contrast characteristics of a photographic film for a particular range of exposure. The exposure needed to produce an image is also determined.
It is also called Hurter and Driffield curve (or H & D curve), named after Ferdinand Hurter and Vero Charles Driffield who first developed it.
Also called:


You will also like...

Homo Species
The Homo Species

The evolution of the species of the genus "Homo" led to the emergence of modern humans. Find out more about human evolut..

Plant Water Regulation
Plant Water Regulation

Plants need to regulate water in order to stay upright and structurally stable. Find out the different evolutionary adap..

Salmon jumping upstream in the river
Lotic Communities & Animals

A running water environment offers numerous microhabitats for many types of animals. Similar to plants, animals in lotic..

mRNA
Protein Synthesis

Part of the genetic information is devoted to the synthesis of proteins. mRNA, a type of RNA, is produced as a transcri..

Fossil trilobite imprint in the sediment
Insects

There are more species of insects than any other species combined. This surely illustrates that insects have the selecti..

Genetics and Evolution
Genetics and Evolution

Humans are diploid creatures. This means that for every chromosome in the body, there is another one to match it. Howeve..